TH36277A - Switchgear for generators of generating stations and transformers with three-position disconnectors. - Google Patents

Abstract

DC60 (29/01/42) The switchgear consists of one circuit breaker with one open position for isolating the generator from the network and one closed position for connecting the generator to the network, along with one disconnect switch with a fixed pole connected to the generator and one movable contact connected to that fixed pole and which can move relative to it to be in (when the circuit breaker is open) position one, connecting the generator to the starting circuit, and position two, connecting the generator to ground. The movable contact of the disconnect switch also enters a third position, where it is formed into a significant overhang with equal potential to the fixed pole. When the circuit breaker is closed, the movable contact does not conduct current to the generator, thus providing the advantage of reducing the size of the contact so that it can withstand only transient electrical conditions in positions one and three. The switchgear consists of A circuit breaker with one open position for isolating the generator from the network and one closed position for connecting the generator to the network, along with a disconnect switch with a fixed pole connected to the generator and a movable contact connected to that fixed pole that can move in (when the circuit breaker is open) position one, connecting the generator to the starting circuit, and position two, connecting the generator to ground. The movable contact of the disconnect switch also moves to a third position, forming a significant overhang equal to that of the fixed pole. When the circuit breaker is closed, the movable contact does not conduct current to the generator, thus providing the advantage of reducing the contact size to achieve the necessary transient electrical withstand capability in positions one and three.

Claims (2)

1. Switchgear located between the power station's generator and the medium or high voltage network transformer. This switchgear consists of one circuit breaker with one open position for isolating the generator from the network and one closed position for connecting the generator to the network; and one disconnect switch with a fixed pole connected to the generator, and one contact connected to that fixed pole and which is movable relative to it to enter (when the circuit breaker is open) position one, connecting the generator to the starter circuit, and position two, connecting the generator to ground. The movable contact of the disconnect switch also enters a third position, forming a significant overhang with equal potential to the fixed pole of the disconnect switch. When the circuit breaker is closed, the movable contact of the disconnect switch enters a third position. 2. Switchgear conforming to claim 1 where the circuit breaker is a generator circuit breaker connected between the generator and the disconnect switch (Clause 2, page 1, figure 1).